I Bond (1 to 30 year duration): limited purchase amount, 0.4% yield above inflation, better relative deflation protection, minimum one year holding period, tax deferred option, 3 month penalty for early redemption
TIPS (10+ year duration): essentially unlimited purchase amount, 1.5% yield above inflation, limited deflation protection, no minimum holding period, tax deferred only if held in tax-deferred account, can be sold at market price
which do you prefer at this time?